There are five Boolean operators that can be used to manipulate TRUE/FALSE values. These operators have the following meanings, where x and y represent values of TRUE or FALSE.
SELECT ALL WHERE LAST_NAME = "Smith" AND FIRST_NAME = "John"
finds all records with the name John Smith. But the query
SELECT ALL WHERE LAST_NAME = "Smith" OR FIRST_NAME = "John"
finds all records with the last name "Smith" or the first name "John."
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